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Book Chapter

Mag Susceptibility Contrast versus Structure

By
R. I. Gibson
R. I. Gibson
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Published:
January 01, 1998

Abstract

Magnetic methods are known to be “nonunique” in their interpretation, but certain generalities are usually true. For example, it is fair to say that most highamplitude magnetic anomalies indicate large contrasts in susceptibility, which in turn indicate large variations in intrabasement rock type. “High amplitude” means anomalies on the order of 150 or 200 nT (gamma) or more. The figure here shows the difference between a simple susceptibility contrast (about a 300-nT anomaly) and a large structure (1219-m, or 4000-ft, fault, producing a 25-nT anomaly). If such features are superimposed on each other, it can be very difficult to separate the effects of structures and susceptibility contrasts. Inasmuch as major intrabasement contacts are often weak zones that may be rejuvenated by later tectonism, this separation is important, even though it may be difficult.

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Contents

Society of Exploration Geophysicists Geophysical References Series

Geologic Applications of Gravity and Magnetics: Case Histories

Richard I. Gibson
Richard I. Gibson
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Patrick S. Millegan
Patrick S. Millegan
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Society of Exploration Geophysicists
Volume
8
ISBN electronic:
9781560801832
Publication date:
January 01, 1998

GeoRef

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